Study On Hydrazine Fuel Cell Catalyst Consisting Of A Ni-Fe Alloy By Electrodepositionon Method

As a potential reactor in fuel cells, hydrazine (N2H4) has unique advantages including superior theoretical standard equilibrium potential, high power density and environmentally benign products, all of which sparked our interest in developing high-power density direct hydrazine-air fuel cells. As a Important link in the production of hydrazine fuel cell, research the high-performance hydrazine fuel cell electrocatalyst has the vital significance.In this paper, in terms of hydrazine fuel cell anode catalyst study, we present a facile, environmentally friendly and efficient noble metal-free pulse reversal plating method for large scale produce of Ni-Fe nanoparticle alloys, which supported on the advanced carbon materials. TEM images of Ni-Fe nanoparticle alloys as shown. The Ni-Fe nanoparticles successful growthed on the carbon materials. XRD patterns of Ni-Fe nanoparticles samples indicating all Ni-Fe nanoparticles were face-centered cubic substitutional solid solutions. By changing the alloy of nickel and iron composition series experiments, we find the Ni85Fe15 is the best combination of metal ratios, possess superior electrocatalytic activity for hydrazine electrooxidation. Raman spectra of carbon materials samples before and after pulse reversal plating, suggests that the sp2 carbon network of carbon materials was not damaged by pulse reversal plating, so the carbon support should retain its good electrical conductivity. The Tafel behavior of the pure Ni and Ni85Fe15 alloy indicates that Ni85Fe15 has well resistance. At last, combination with predecessors' experience and our experiments, the following mechanism for the oxidation of hydrazine at negative potentials is proposed.Besides the above experiment, we report a one step strategy for Ni85Fe15lloy coated 1-3 dimension nano material (carbon nano tubes, graphene-like MoS2 and cobalt nano particles) as the catalyst for hydrazine oxidation, using electrodeposition of composite coating and hydrogen bubble template technique. TEM images shows the Ni-Fe alloy not entirely coated the carbon nano tubes, but successfully coated around the graphene-like MoS2 and cobalt nano particles. XRD patterns of Ni-Fe nanoparticles samples indicating all Ni-Fe nanoparticles were face-centered cubic substitutional solid solutions. Use this three kinds of core-shell materials as catalyst, cyclic voltammogram curve of theirs can indicate three kind of catalysts possess superior electrocatalytic activity for hydrazine electrooxidation. Through the electrochemical noise test, the mechanism for preparation of core-shell materials is proposed.